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    <title>Document</title>
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<body>
    <div id="div1">
        这是DIV1
        <div id="div2">
            这是DIV2
        </div>
    </div>
    <a href="https://www.baidu.com" id="a">链接</a>
    <ul id="ul">
        <li>
            <a href="https://www.baidu.com" class="al">链接一</a>
        </li>
        <li>
            <a href="https://www.baidu.com" class="al">链接二</a>
        </li>
        <li>
            <a href="https://www.baidu.com" class="al">链接三</a>
        </li>
    </ul>
    <script src="./Day3.js"></script>
</body>
</html>